linux-kernel - Re: NULL pointer dereference during memory hotremove

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Message-ID: <75ae93ee-7897-2ab9-1f15-687ab5b87e72@redhat.com>
Date:   Fri, 17 May 2019 16:58:33 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>,
        Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "tiwai@...e.de" <tiwai@...e.de>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "bp@...e.de" <bp@...e.de>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        "zwisler@...nel.org" <zwisler@...nel.org>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "Busch, Keith" <keith.busch@...el.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "Huang, Ying" <ying.huang@...el.com>,
        "Wu, Fengguang" <fengguang.wu@...el.com>,
        "baiyaowei@...s.chinamobile.com" <baiyaowei@...s.chinamobile.com>
Subject: Re: NULL pointer dereference during memory hotremove

On 17.05.19 16:38, Michal Hocko wrote:
> On Fri 17-05-19 10:20:38, Pavel Tatashin wrote:
>> This panic is unrelated to circular lock issue that I reported in a
>> separate thread, that also happens during memory hotremove.
>>
>> xakep ~/x/linux$ git describe
>> v5.1-12317-ga6a4b66bd8f4
> 
> Does this happen on 5.0 as well?
> 

We have on the list

[PATCH V3 1/4] mm/hotplug: Reorder arch_remove_memory() call in
__remove_memory()

Can that help?

-- 

Thanks,

David / dhildenb